JP2004087102A - Disk-like information recording medium, its recording method and reproduction method, and its information recording device and information reproducing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problems of the occurrence of loss in access time and of causing underflow in buffer memory data due to no high accuracy in the setting of an access performance model in a reproduction standard model for assuring real time reproduction on a disk-like information recording medium. <P>SOLUTION: The reproduction standard model contains: a pickup reading real time data from the disk-like information recording medium; a buffer memory temporarily holding the real time data read by the pickup; and a decoding module reading the real time data from the buffer memory for processing. The access time Tacc of the reproduction standard model is represented by the following formula: Tacc=A×dN+Trev+B. In the formula, dN is the difference in the number of revolutions of disk-like recording medium, Trev is the rotation waiting time at access target position, and A and B are constants. <P>COPYRIGHT: (C)2004,JPO

Description

The present invention relates to a disk-shaped information recording medium such as a rewritable optical disk for recording and reproducing real-time data such as video and audio, a recording and reproducing method, and an information recording apparatus and an information reproducing apparatus.

Conventionally, a DVD-RAM has been known as an information recording medium for recording / reproducing real-time data such as video and audio on a disk, and an example thereof is described in Patent Document 1. In the example of Patent Document 1, in order to guarantee real-time reproduction of data separated from the disk, a reproduction standard model as shown in FIG. 8A is defined, and the reproduction standard model has an access distance and an access as shown in FIG. 8B. An access performance model that defines the relationship with time was set. Here, the reproduction standard model is created for the purpose of determining the conditions under which various types of reproducing apparatuses can continuously reproduce even if they reproduce real-time data on an optical disk. According to the access performance model shown in FIG. 8B, in order to reproduce real-time data on the reproduction standard model, data in the buffer memory 103 does not cause an underflow during access and reproduced video and audio are not interrupted. The storage area is set in advance, and data is recorded by arranging real-time data in the set storage area. In this way, by recording data in a storage area that satisfies the above-described access performance model, real-time data can be continuously reproduced substantially at the time of subsequent reproduction substantially as set in the standard reproduction model.

Japanese Patent No. 3171584

However, in this conventional recording / reproducing method, since the setting of the access performance model in the reproduction standard model is not always highly accurate with respect to the actual characteristics of the access distance and the access time, a loss of access time occurs during reproduction. There is a problem that the data in the buffer memory 103 underflows.

That is, the conventional access performance model shown in FIG. 8B is configured such that the access range is divided into several sections and the access time is constant in each section or the access time is proportional to the distance. It had been. However, the relationship between the actual access distance and the access time has a non-linear relationship, and in this conventional reproduction standard model, the actual access was performed because the access performance was originally set at a lower level. In that case, there was a large loss in access time.

In view of the problems of the conventional recording / reproducing method, an object of the present invention is to realize efficient real-time recording by improving the setting accuracy of an access performance model.

According to a first aspect of the present invention, there is provided a recording method for recording a real-time file including real-time data on a disc-shaped information recording medium so that the real-time data is continuously reproduced when reproducing the real-time data according to a reproduction standard model. Provided.

The reproduction standard model includes a pickup for reading real-time data from a disc-shaped information recording medium, a buffer memory for temporarily holding the real-time data read by the pickup, and a decoding module for reading and processing the real-time data from the buffer memory. . The access performance of the reproduction standard model is given by the following equation.

Tacc = A · dN + Trev + B,
Here, Tacc is an access time, which is the time required for the pickup to move from one area to another area, dN is the rotation speed difference of the disk-shaped recording medium before and after the movement of the pickup, and Trev is the access target position. Where A is a constant and B is a constant.

The recording method is an area from a plurality of logically continuous unused areas in the disc-shaped information recording medium that satisfies a real-time playback condition that is a playback condition that does not cause an underflow during playback determined based on the access performance of a playback standard model. As a data recording area, and recording real-time data in the searched data recording area.

In the second aspect of the present invention, when reproducing real-time data according to a reproduction standard model, an information recording apparatus for recording a real-time file including real-time data on a disc-shaped information recording medium so that the real-time data is continuously reproduced Is provided.

The reproduction standard model includes a pickup for reading real-time data from a disc-shaped information recording medium, a buffer memory for temporarily holding the real-time data read by the pickup, and a decoding module for reading and processing the real-time data from the buffer memory. . The access performance of the reproduction standard model is given by the following equation.

Tacc = A · dN + Trev + B,
Here, Tacc is an access time, which is the time required for the pickup to move from one area to another area, dN is the rotation speed difference of the disk-shaped recording medium before and after the movement of the pickup, and Trev is the access target position. Where A is a constant and B is a constant.

The recording device is an area from a plurality of logically continuous unused areas in the disc-shaped information recording medium that satisfies a real-time reproduction condition that is a reproduction condition that does not cause an underflow at the time of reproduction determined based on the access performance of the reproduction standard model. And a recording means for recording real-time data in the searched data recording area.

In the third aspect of the present invention, when reproducing real-time data in accordance with a reproduction standard model, real-time data is read from a disc-shaped information recording medium on which a real-time file including real-time data is recorded so that the real-time data is continuously reproduced. Is provided.

The reproduction standard model includes a pickup for reading real-time data from a disc-shaped information recording medium, a buffer memory for temporarily holding the real-time data read by the pickup, and a decoding module for reading and processing the real-time data from the buffer memory. . The access performance of the reproduction standard model is given by the following equation.

Tacc = A · dN + Trev + B,
Here, Tacc is an access time, which is the time required for the pickup to move from one area to another area, dN is the rotation speed difference of the disk-shaped recording medium before and after the movement of the pickup, and Trev is the access target position. Where A is a constant and B is a constant.

The reproducing method includes the steps of reading real-time data from a disc-shaped information recording medium, temporarily storing the read real-time data in a buffer memory, reading the real-time data stored in the buffer memory, and decoding the read real-time data by a decoder. , After accessing one real-time data, accessing the next real-time data within the access time Tacc.

In the fourth aspect of the present invention, when reproducing the real-time data according to the reproduction standard model, the real-time data is reproduced from the disc-shaped information recording medium on which the real-time file including the real-time data is recorded so that the real-time data is continuously reproduced. An information reproducing apparatus for reproducing data is provided.

The reproduction standard model includes a pickup for reading real-time data from a disc-shaped information recording medium, a buffer memory for temporarily holding the real-time data read by the pickup, and a decoding module for reading and processing the real-time data from the buffer memory. . The access performance of the playback standard model is given by the following equation.
Tacc = A · dN + Trev + B,
Here, Tacc is an access time, which is the time required for the pickup to move from one area to another area, dN is the rotation speed difference of the disk-shaped recording medium before and after the movement of the pickup, and Trev is the access target position. Where A is a constant, B is a constant,
The information reproducing apparatus includes a data reproducing unit that reads real-time data from a disc-shaped information recording medium, a buffer memory that temporarily stores the read real-time data, and a decoder that reads and decodes the real-time data stored in the buffer memory. Is provided. After accessing one real-time data, the data reproducing means accesses and reproduces the next real-time data within the access time Tacc.

According to a fifth aspect of the present invention, there is provided a disk-shaped information recording medium for recording a real-time file including the real-time data so that the real-time data is continuously reproduced when the real-time data is reproduced according to a reproduction standard model. You.

The reproduction standard model includes a pickup for reading real-time data from a disc-shaped information recording medium, a buffer memory for temporarily holding the real-time data read by the pickup, and a decoding module for reading and processing the real-time data from the buffer memory. . The access performance of the reproduction standard model is given by the following equation.

Tacc = A · dN + Trev + B,
Here, Tacc is an access time, which is the time required for the pickup to move from one area to another area, dN is the rotation speed difference of the disk-shaped recording medium before and after the movement of the pickup, and Trev is the access target position. Where A is a constant and B is a constant.

Real-time data is stored in an area that satisfies the real-time playback condition, which is a playback condition that does not cause an underflow during playback, which is determined based on the access performance of the playback standard model in a plurality of logically continuous unused areas in the disc-shaped information recording medium. Has been recorded.

According to the present invention, in a recording / reproducing method of a disc-shaped information recording medium and an information recording apparatus and an information reproducing apparatus thereof, regarding setting of an access performance model, characteristics of a spindle motor and a rotation waiting time are used, and before and after movement of a pickup. By approximating the expression of the access performance by paying attention to the spindle rotational speed difference, an accurate drive access operation can be easily estimated, and an effect of realizing reliable real-time recording can be obtained.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1A is a diagram showing a reproduction standard model for determining real-time data arrangement conditions according to the present invention, and FIG. 1B is a diagram showing the access performance thereof. The reproduction standard model shown in FIG. 1A includes a disk 101, a pickup 102 for reading data from the disk 101, a buffer memory 103 for temporarily storing the read data, and a decoding module for decoding data transferred from the buffer memory 103. 104. Vin is a data rate when data is transferred from the disk 101 to the buffer memory 103. Vout is a data rate when data is transferred from the buffer memory 103 to the decoding module 104. Vin is set to a value larger than the maximum data rate Vout of real-time data assumed in the application.

FIG. 1B is a diagram showing the relationship between the difference in the number of rotations of the spindle motor, that is, the difference in the number of rotations of the disk, and the access time when the pickup 102 of the reproduction standard model accesses. In the present embodiment, the disk rotation speed is controlled by the CLV (Constant Linear Velocity) method. If the areas to be accessed are different in the radial direction, the disk rotation speed will be different. In FIG. 1B, the disc rotation speed difference is a difference between the rotation speed before and after the pickup 102 moves from one area to another area. In FIG. 1B, the access performance model is set based on the relationship between the disk rotation speed difference and the access time based on the following equation (1) on the premise shown below.

In order to access the pickup 102 as shown in FIG. 2B, a seek for moving the pickup 102 in the radial direction of the disk 101 is required, and further, the disk is rotated as shown in FIG. It is also necessary to change the rotation speed of the spindle motor to the target rotation speed. The seek includes a coarse seek in which the pickup is moved to a position near the target track, and a fine seek in which the pickup is finely adjusted after the coarse seek and the pickup is moved onto the target track. In FIG. 2B, the time required for the coarse seek can be set sufficiently smaller than the time required for changing the rotation speed of the spindle motor, and the access time in the performance of the spindle motor used in the optical disk drive is In addition, the time required for changing the spindle speed becomes dominant.

Generally, the motor torque Trq can be expressed by the following equation.

Trq = (N1-N2) · J / (dt · Kj)
J: inertia of the disk, dt: spindle lock time, Kj: conversion constant, N1: rotation speed before movement, N2: rotation speed after movement.

Therefore, paying attention to the fact that the spindle lock time is proportional to the difference between the number of rotations before and after the movement, the access time Tacc can be formulated as the following equation (1).

Tacc = (spindle lock time) + (rotation waiting time) + other time = (N1−N2) · J / (Trq · Kj) + Trev + B
≒ A ・ dN + B (1)
Here, N1: initial rotation speed, N2: target rotation speed, dN: rotation speed difference (= N1-N2), J: disk inertia, Trq: motor torque, Kj: conversion constant, Trev: average rotation waiting time, A, B: Constant.

In the equation (1), the rotation waiting time Trev can be omitted if it is sufficiently smaller than the spindle lock time A · dN.

と When specific numerical values are applied to the relational expression expressed by the expression (1), the following is obtained. That is, if N1 = 3000 rpm, N2 = 1000 rpm, dN = 2000 rpm, J = 300 gf · cm · cm, Trq = 100 gf · cm, and Kj = 9350, A · dN = 0.541 sec. On the other hand, the average rotation waiting time Trev = 60/1000/2 = 0.03 sec at the target rotation speed N2, which is a value sufficiently smaller than the spindle lock time A · dN. Further, if the constant B is set to 0.1, the combined access time becomes Tacc = 0.71 sec.

From equation (1), if the rotation waiting time Trev is sufficiently small, the access time Tacc can be estimated linearly with respect to the disk rotation speed difference dN. From this, an access performance model as shown in FIG. 1B was assumed. On the other hand, the number of rotations and the difference in the number of rotations of the disk can be uniquely obtained from the relationship with the linear velocity of the disk once the initial position and the target position of the pickup are known.

Assuming that the source address when moving from one area to another area is A1, the destination address is A2, the respective radial positions are r1 and r2, and the radial position at the place where the address is 0 is r0. Since the addresses A1 and A2 are proportional to the belt-like area, they are expressed by the following equation with C as a constant.

A1 = C · (π · r1 2 -π · r0 2)
A2 = C · (π · r2 2 -π · r0 2)
Since the rotation speed at a certain address is inversely proportional to the radius, the rotation speeds of A1 and A2 are N1, N2, and D as constants, and N1 = D / r1 and N2 = D / r2. By using this, the number of rotations can be obtained from the address.

Accordingly, the access performance model shown in the equation (1), that is, the access performance model shown in FIG. 1B is established for an arbitrary initial position and a target position of the pickup. When the access distance is short, dN becomes small and Trev becomes dominant. In this case, since Trev can be calculated according to the position of the pickup, the access performance can be accurately obtained.

The conventional access performance model shown in FIG. 8B divides an access range into several sections, and is configured based on an approximate access time that is simply proportional to a certain access time or distance in each section. Therefore, the access performance inherently has a lower setting, and a large loss has occurred in the actual access time.However, in the access performance model of the present invention, the actual access model is used in all access areas. The access time can be obtained with high accuracy in accordance with the following.

Next, in the reproduction standard model shown in FIG. 1A, when data is read, data is accumulated in the buffer memory 103 at the Vin-Vout rate, and when the pickup 102 moves, the data is read. Since data cannot be read, data in the buffer is consumed at the rate of Vout. For this operation model, the transition of the data amount in the buffer memory 103 when the reproduction standard model reproduces the real-time data can be quantitatively calculated using the specific access time value. Therefore, when the reproduction standard model reproduces real-time data, if the data recording area is arranged on the disk 101 so that the data in the buffer memory 103 does not underflow, the real-time data can be reproduced continuously. become. For this reason, at the time of data recording, based on the above access performance model, an arrangement condition of an area where real-time data is to be recorded (hereinafter referred to as “real-time extent”) is defined.

With reference to FIGS. 3A and 3B, the physical layout of the CLV format rewritable optical disk used in the present embodiment will be described.

3A, the rewritable optical disc 101 has a lead-in area 401 from the inner periphery, a DMA (Defective Management Area) area 402 for managing defective sectors on the disc, a data area 420, and a lead-out area 412. Digital data is recorded in each area, and the digital data is managed in units called “sectors”. The data area 420 includes a spare area 403 for replacing a defective sector.

ＢAs shown in FIG. 3B, the information area of the rewritable optical disc 101 is assigned a physical sector number for each physical sector from the inner circumference. On the other hand, an area where user data can be recorded is defined as a volume space to which a logical sector number is assigned for each logical sector. The volume space is a space excluding the lead-in area 401, the DMA area 402, the unused area in the spare area 403, the defective sector registered in the PDL (Primary \ Descriptive \ List) in the DMA, and the lead-out area 412 from the information area. is there.

サ ー A certification process is performed when the optical disk 101 is initialized. When a defective sector is detected by the certification process, the defective sector is registered in the PDL. No logical sector number is assigned to a defective sector. In this case, even if the logical address of the sector is continuous, it includes a physically discontinuous area. Therefore, when recording / reproducing over the preceding and following portions, it is necessary to perform a seek. Note that a defective sector detected during data recording is replaced with a spare area 403 and registered in an SDL (Secondary Defect List) in the DMA area 402.

FIG. 4 is a diagram showing a more detailed data structure of the rewritable optical disc in the present embodiment.

In FIG. 4, the information area 430 composed of physical sectors includes a lead-in area 401, a DMA area 402, a data area 420, and a lead-out area 412. A spare area 403 for alternately recording a defective sector or a defective block is arranged at the head of the data area 420, and a volume space is formed from the subsequent areas.

(4) In the data area 420, the allocated areas 405, 407, 408, and 409 are areas in which data has already been recorded. A defective ECC block 406 is formed between the real-time extent RT1 and the real-time extent RT2. Further, real-time extents RT3, RT4, and RT5 are formed following the allocated regions 407, 408, and 409, respectively. The defective ECC block 406 is a defective block detected during data recording, and data that should be originally recorded in the defective ECC block is recorded in the spare area 403 as a substitute. After the real-time extent RT5, an empty extent 410 and an unrecorded area 411 are formed. Here, the real-time extents RT1 to RT5 are arranged so as to satisfy a condition defined by a reproduction standard model having a predetermined access performance.

Next, the information recording / reproducing apparatus of the present invention will be described. FIG. 5 shows a block diagram of the information recording / reproducing apparatus. Hereinafter, an operation of recording a real-time file on the optical disc 101 by the information recording / reproducing apparatus will be described.

The information recording / reproducing apparatus includes a system control unit 501, an I / O bus 506, an optical disk drive 507, a remote controller for inputting a recording mode and the like, an input device 508 such as a mouse, a keyboard, and the like. AV data), and a decoder 510 that decodes and outputs AV data.

The system control unit 501 includes a recording mode setting unit 502, an allocation parameter memory 503, a file system processing unit 504, and a file system processing memory 505.

The file system processing unit 504 includes a playback mode notification unit 541, a data amount calculation unit 542, a time information calculation unit 543, an unallocated area search unit 544, a physical discontinuous position acquisition unit 545, and a data recording unit that controls data recording. 546, and a data reading unit 547 for controlling data reading. These means use the file system processing memory 505.

The file system processing memory 505 includes a memory 551 for storing position information of an empty extent, a memory 552 for storing time information, a memory 553 for storing position information of a pre-allocated area, and position information indicating physically discontinuous positions. 554, a bit map memory 555, and a data buffer memory 556.

The access performance of the optical disk drive 507, the recording rate at the time of data recording, and the data recording performance realized by the size of the data buffer memory 556 depend on the reproduction standard model shown in FIGS. 1A and 1B for recording. Satisfies the recording performance realized when

(4) The information recording / reproducing apparatus configured as described above performs a recording operation so as to satisfy the above-described reproduction standard model. In the reproduction standard model, a data storage area (empty extent / real-time extent) is set in advance in accordance with the access performance model so that data in the buffer memory 103 does not underflow during reproduction, and data is recorded in the set area. By doing so, it is possible to continuously reproduce real-time data during subsequent data reproduction.

Hereinafter, the operation of the information recording / reproducing apparatus will be described.

(Step 1) A recording mode and a recording time are instructed from the input device 508. The recording mode setting unit 502 determines the maximum transfer data rate Vout from the buffer memory 556 to the decoder 510, the data rate Vin read from the disk 101, the data size SR to be recorded, the buffer size Bmax, and various other access times. Then, they are stored in the allocation parameter memory 503. Here, the maximum data rate Vout is a fixed value, and is set to a value that enables recording even when recording at that rate is continued.

(Step 2) The optical disc drive 507 causes the physical discontinuous position acquisition unit 545 to report positional information of a defective sector or a defective block registered in the PDL and the SDL as physical discontinuous position information on the disk 101. To instruct. Physical discontinuous position information reported from the optical disc drive 507 is held in the physical discontinuous position memory 554.

The unallocated area search unit 544 uses the position information of the unallocated area held in the bitmap memory 555 and the physical discontinuous position information stored in the physical discontinuous position memory 554 to perform ECC. An unallocated area on the disk that is physically continuous in block units is searched for as a pre-allocated area. The retrieved position information of the pre-allocated area is stored in the pre-allocated area memory 553. This search operation is executed until the total size of the searched pre-allocated area exceeds the data size SR.

FIG. 6A is a diagram showing an arrangement of pre-allocated areas obtained by searching for a physically continuous unallocated area in ECC block units by the above-described procedure. Prior allocation areas A1 to A5 are allocated.

(Step 3) The time information calculation unit 543 uses the position information of the pre-allocated area stored in the pre-allocated area memory 553 and the various access times stored in the allocation parameter memory 503 to perform each pre-allocation. The read time TRi (i corresponds to i of the area number Ai of the pre-allocated area shown in FIG. 6A) when the area is read at the data rate Vin, and the access time Ti, i + 1 between the pre-allocated areas (the pre-allocation shown in FIG. 6A) (The access time between the areas Ai and Ai + 1). In FIG. 6A, read times TR1 to TR5 are times required for reading the pre-allocated areas A1 to A5, respectively. T1,2 is a read delay time due to a defective ECC block. T2,3, T3,4, T4,5 are the times (access times) required to access the pre-allocated areas A2 and A3, A3 and A4, and A4 and A5, respectively. These access times are obtained from the access performance of the reproduction standard model shown in FIG. The obtained access time Ti, i + 1 is held in the time information memory 552 together with the read time TRi.

(Step 4) Next, the data amount calculation unit 542 performs the following steps using the read time and the access time stored in the time information memory 552.

(4) First, the amount of data in the buffer memory 556 at the end of reading the pre-allocated area is calculated. FIG. 7 shows a change in the amount of data in the buffer memory 556 when data in the pre-allocated area is read. For example, at time t1 after reading the pre-allocated area A1, the data amount increases at a data rate of (Vin-Vout) during the period TR1.

(Step 5) It is checked whether the calculated total data amount of the pre-allocated area exceeds the size SR set in Step 1. If the value does not exceed SR, it is checked whether the calculated total data amount exceeds the allocation level BL (= Vout × TL, TL is a full stroke access time). When the amount of data in the buffer exceeds BL, no underflow occurs even if any area on the disk is accessed from the end of the pre-allocated area. Therefore, the area from the leading pre-allocated area to the pre-allocated area where the total data amount does not exceed the size SR and exceeds the allocation level BL is determined as an area that does not cause underflow, and these areas are defined as real-time data. It is registered as a recordable empty extent.

(Step 6) Next, the amount of data in the buffer memory 556 at the start of reading the pre-allocated area is calculated. At time t2 before reading the pre-allocated area A2 in FIG. 7, the data amount decreases at the data rate of Vout in the periods T1,2.

(Step 7) It is checked whether the total data amount calculated here becomes negative. If the value becomes negative, this access means that the buffer underflows and data is interrupted. If it does not become negative, the process returns to the top of (Step 4). In FIG. 6A, pre-allocated areas A2 to A5 are calculated by repeating (step 4) to (step 6). During this time, the data amount exceeds the allocation level BL in each section of TR3, TR4, and TR5 shown in FIG. 7, so that the pre-allocated areas A1 to A5 are sequentially allocated as empty extents E1 to E5 as shown in FIG. The position information is stored in the memory 551 for use. The empty extent is an area reserved for recording real-time data, but is an area in which data has not yet been recorded.

領域 Through the above steps, areas (empty extents E1 to E5) in which real-time data can be recorded are obtained.

(Step 8) Next, a procedure for recording data on the information recording medium will be described. The video / audio data input to the information recording / reproducing apparatus is encoded by the encoder 509 into AV data by using a variable length compression method, and is transferred to the data buffer memory 556. The data recording unit 546 records the AV data in the empty extents E1 to E5 already allocated.

As shown in FIG. 6B, the data is recorded in each of the empty extents, so that the empty extents become real-time extents. Since the empty extents E1 to E5 are allocated using a fixed value data rate Vout capable of coping with the highest image quality and sound quality, when the recording of the AV data is completed, some of the areas are left unused. It is. That is, of the empty extent E5, the area where the data is recorded is defined as the real-time extent RT5. Further, of the empty extent E5, an area where AV data is not recorded only in a part of the ECC block at the end of the AV data to be recorded is defined as an empty extent 410, and an area where AV data is not recorded in ECC block units is defined as an unrecorded area 411. .

Next, the operation of the information recording / reproducing apparatus for reproducing a real-time file from the optical disk 101 will be described.

(4) Real-time data is recorded on the optical disc 101 in an area satisfying the real-time reproduction condition. The data reading unit 547 reads real-time data from the optical disc 101. When reading the real-time data continuously, the data reading unit 547 accesses one real-time data, reads the next real-time data within the access time Tacc, and then reads the data. The read real-time data is temporarily stored in the buffer memory 556. The real-time data stored in the buffer memory 556 is then decoded via a decoder 510 defined as a decoding module in the standard reproduction model, and video and audio are reproduced. Real-time data arranged so as to satisfy the real-time reproduction condition satisfies the specified performance, thereby enabling continuous data reproduction.

The functions of the embodiments of the present invention may be realized by hardware, but a part or all of the processing may be performed by software of a microcomputer.

特性 Characteristic data such as constants A, B, and Trev in Equation (1) relate to the basic performance of the optical disk drive 507. That is, the constant A includes the torque value Trq of the spindle motor, and this value depends on the access performance of the optical disk drive 507. Further, the average rotation waiting time Trev in the equation (1) varies depending on the drive performance whether the recording / reproducing speed of the optical disk drive 507 is a standard speed, a double speed, or higher. Further, the constant B relates to drive performance such as a time required for issuing an interface command of the optical disk drive 507 and a time required for ECC decoding. These characteristic data are stored in advance in a non-illustrated non-volatile memory of the system control unit 501, for example, and read from the non-volatile memory when the apparatus and the system control unit 501 are started up. May be performed to construct a reproduction standard model.

The constant A in the equation (1) includes the inertia J of the disk. Since the value J of the inertia may vary due to manufacturing tolerances of the disk, the disk is inserted into the recording / reproducing apparatus. In such a case, the disk is rotated at a predetermined torque value, the value is estimated from the following equation based on the time required at that time, a constant A is obtained based thereon, and the constant B is further estimated in advance. These characteristic data can also be stored in a non-volatile memory (not shown) of the system control unit 501.

J = dt · Kj · Trq / (N1-N2)
Note that characteristic data such as constants A, B, and Trev can be recorded in a specific area of the disc.

When reproducing an optical disk on which data is recorded based on the above characteristic data, the characteristic data is read from the optical disk, and the recording / reproducing apparatus stores the characteristic data in advance corresponding to the performance of the optical disk drive. If the characteristic data read from the disk exceeds the drive performance as compared with the value, a warning that real-time reproduction cannot be performed may be issued. This is because an underflow may occur due to inaccessibility at a predetermined access time.

In the derivation of the equation (1), at least detailed items such as the control method of the acceleration and deceleration of the spindle motor are omitted, but more precisely, the following equation may be used. Can be modeled to accuracy.

Tacc = A · dN + B + f (N)
Here, N: instantaneous rotation speed during acceleration / deceleration, f (N): function of N.

In the rough seek shown in FIG. 2B, the movement of the pickup is determined by changing the access time according to a trapezoidal speed profile including an acceleration region at a constant acceleration, a constant speed region, and a deceleration region at a constant deceleration. You may be able to estimate. For example, when the acceleration and the deceleration are set to 0.1 G and the constant speed is set to 5 cm / sec, the time required for the coarse seek becomes more dominant than the time required for the spindle lock in the access time.

In the fine seek shown in FIG. 2B, the movement of the lens provided on the pickup may be estimated so as to move in a fixed time for each track, or every ten to several hundred tracks. May be estimated to move in a certain time.

INDUSTRIAL APPLICABILITY The optical disc and the optical disc recording / reproducing apparatus and method according to the present invention can easily estimate an accurate drive access operation, thereby realizing reliable real-time recording and recording / reproducing real-time data such as optical video and audio. And a method and apparatus for recording / reproducing a rewritable optical disc for recording.

FIG. 3A is a diagram illustrating a configuration of a reproduction standard model of the present invention, and FIG. 3B is a diagram illustrating access performance of the reproduction standard model of the present invention. 3A is a diagram illustrating a relationship between an access time and a spindle rotation speed, and FIG. 3B is a diagram illustrating a relationship between an access time and a seek distance. FIG. 1 is a diagram showing a physical format of a rewritable optical disk according to an embodiment of the present invention. FIG. 3 is a data structure diagram showing a data area of a rewritable optical disk. FIG. 3 is a data structure diagram showing an area configuration of an information recording medium. FIG. 2 is a block diagram of the information recording / reproducing apparatus of the present invention. FIG. 4 is a diagram showing an area allocated for a real-time file by the recording method of the present invention (before real-time data recording). FIG. 7 is a diagram showing an area allocated for a real-time file by the recording method of the present invention (after recording real-time data). FIG. 7 is a diagram showing a transition of data in a buffer memory calculated by the recording method of the present invention. FIG. 9 is a diagram showing a configuration of a conventional reproduction standard model. FIG. 10 is a diagram showing access performance of a conventional reproduction standard model.

Explanation of reference numerals

101 Optical disk 103 Buffer memory 104 Decoding module 404, 411 Unrecorded area 405, 407-409 Already allocated area 410 Empty extent 420 Data area 430 Information area RT1-RT5 Real time extent

Claims (5)

A method for recording a real-time file including the real-time data on a disc-shaped information recording medium such that the real-time data is continuously reproduced when reproducing the real-time data according to a reproduction standard model,
The playback standard model includes a pickup for reading the real-time data from the disc-shaped information recording medium, a buffer memory for temporarily holding the real-time data read by the pickup, and a process for reading and processing the real-time data from the buffer memory. A decoding module, wherein the access performance of the reproduction standard model is given by the following equation:
Tacc = A · dN + Trev + B,
Here, Tacc is an access time, which is the time required for the pickup to move from one area to another area, dN is the rotation speed difference of the disk-shaped recording medium before and after the movement of the pickup, and Trev is the access target position. Where A is a constant, B is a constant,
The recording method is a real-time playback condition that is a playback condition that does not cause an underflow during playback determined from a plurality of logically continuous unused areas in the disc-shaped information recording medium based on the access performance of the playback standard model. A method for recording a disc-shaped information recording medium, comprising: a step of searching for an area satisfying the following as a data recording area; and a step of recording real-time data in the searched data recording area. An information recording device that records a real-time file including the real-time data on a disc-shaped information recording medium so that the real-time data is continuously reproduced when reproducing the real-time data according to a reproduction standard model,
The playback standard model includes a pickup for reading the real-time data from the disc-shaped information recording medium, a buffer memory for temporarily holding the real-time data read by the pickup, and a process for reading and processing the real-time data from the buffer memory. A decoding module, wherein the access performance of the reproduction standard model is given by the following equation:
Tacc = A · dN + Trev + B,
Here, Tacc is an access time, which is the time required for the pickup to move from one area to another area, dN is the rotation speed difference of the disk-shaped recording medium before and after the movement of the pickup, and Trev is the access target position. Where A is a constant, B is a constant,
The recording apparatus includes a plurality of logically continuous unused areas in the disc-shaped information recording medium, and a real-time reproduction condition that is a reproduction condition that does not cause an underflow during reproduction determined based on the access performance of the reproduction standard model. An information recording apparatus comprising: a search unit that searches for an area that satisfies as a data recording area; and a recording unit that records real-time data in the searched data recording area. When reproducing real-time data in accordance with a reproduction standard model, a reproducing method for reproducing the real-time data from a disc-shaped information recording medium on which a real-time file including the real-time data is recorded so that the real-time data is continuously reproduced. hand,
The playback standard model includes a pickup for reading the real-time data from the disc-shaped information recording medium, a buffer memory for temporarily holding the real-time data read by the pickup, and a process for reading and processing the real-time data from the buffer memory. A decoding module, wherein the access performance of the reproduction standard model is given by the following equation:
Tacc = A · dN + Trev + B,
Here, Tacc is an access time, which is the time required for the pickup to move from one area to another area, dN is the rotation speed difference of the disk-shaped recording medium before and after the movement of the pickup, and Trev is the access target position. Where A is a constant, B is a constant,
The reproducing method includes the steps of: reading real-time data from the disc-shaped information recording medium; temporarily storing the read real-time data in the buffer memory; reading the real-time data stored in the buffer memory; A method for reproducing a disc-shaped information recording medium, comprising: decoding; and accessing the next real-time data within the access time Tacc after accessing one real-time data. When reproducing real-time data according to a reproduction standard model, an information reproducing apparatus that reproduces the real-time data from a disc-shaped information recording medium on which a real-time file including the real-time data is recorded so that the real-time data is continuously reproduced. So,
The playback standard model includes a pickup for reading the real-time data from the disc-shaped information recording medium, a buffer memory for temporarily holding the real-time data read by the pickup, and a process for reading and processing the real-time data from the buffer memory. A decoding module, wherein the access performance of the reproduction standard model is given by the following equation:
Tacc = A · dN + Trev + B,
Here, Tacc is an access time, which is the time required for the pickup to move from one area to another area, dN is the rotation speed difference of the disk-shaped recording medium before and after the movement of the pickup, and Trev is the access target position. Where A is a constant, B is a constant,
The information reproducing apparatus includes: a data reproducing unit that reads real-time data from the disk-shaped information recording medium; a buffer memory that temporarily stores the read real-time data; and a real-time data that is read and decoded in the buffer memory. An information reproducing apparatus, comprising: a decoder that accesses one real-time data and then accesses and reproduces the next real-time data within the access time Tacc. A disk-shaped information recording medium for recording a real-time file including the real-time data so that the real-time data is continuously reproduced when reproducing the real-time data according to a reproduction standard model,
The playback standard model includes a pickup for reading the real-time data from the disc-shaped information recording medium, a buffer memory for temporarily holding the real-time data read by the pickup, and a process for reading and processing the real-time data from the buffer memory. A decoding module, wherein the access performance of the reproduction standard model is given by the following equation:
Tacc = A · dN + Trev + B,
Here, Tacc is an access time, which is the time required for the pickup to move from one area to another area, dN is the rotation speed difference of the disk-shaped recording medium before and after the movement of the pickup, and Trev is the access target position. Where A is a constant, B is a constant,
In a region that satisfies a real-time playback condition that is a playback condition that does not cause an underflow during playback determined based on the access performance of the playback standard model in a plurality of logically continuous unused areas in the disc-shaped information recording medium, A disc-shaped information recording medium on which the real-time data is recorded.

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